<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./vue.js"></script>
</head>
<body>
    <div id="app">
        <form>
            <div>
                <label for="" v-show="c==false">全选</label>
                <label for="" v-show="c==true">取消全选</label>

                <input type="checkbox" v-model="c" v-on:checked="c">
            </div>
            <div>
                <label for="">足球</label>
                <input type="checkbox" v-bind:checked="c">
            </div>
            <div>
                <label for="">篮球</label>
                <input type="checkbox" v-bind:checked="c">
            </div>
            <div>
                <label for="">羽毛球</label>
                <input type="checkbox" v-bind:checked="c">
            </div>
        </form>

    </div>
</body>
<script>

    let v = new Vue({
        el:"#app",
        data:{
            c:true
        }
    })



</script>
</html>